Backend Pro Max
Design Intelligence

Saga, CQRS, Outbox, Circuit Breaker, Bulkhead, Idempotency, Leader Election, Rate Limiting, Sharding

Postgres, MongoDB, Cassandra, DynamoDB, Redis, ClickHouse, vector DBs, S3, etcd

Kafka, Redpanda, Pulsar, RabbitMQ, NATS, SQS, SNS, Kinesis, Pub/Sub

In-process LRU, Redis cluster, Memcached, CDN, negative caching, Bloom filters, L1+L2 hybrid

AWS / GCP / Azure / Cloudflare service mapping and equivalents across all major primitives

Prometheus, Grafana, Loki, Tempo, OpenTelemetry, Pyroscope, SLO frameworks, Datadog

OWASP Top 10, CSRF, SSRF, supply chain (SLSA, Sigstore), zero-trust, TLS, PII, SAST

OAuth 2.0+PKCE, OIDC, JWT, SAML, mTLS, passkeys, RBAC/ABAC/ReBAC, SCIM, workload identity

REST, GraphQL, gRPC, WebSocket, SSE, HTTP/2+3, Webhooks, JSON-RPC

Docker, Kubernetes, EKS/GKE/AKS, Helm, ArgoCD, Istio, Envoy, Karpenter

Linearizability, CAP, PACELC, Raft, Paxos, 2PC, snapshot isolation, Lamport clocks

SLO/SLI/error budget, timeouts, retries, circuit breaker, graceful shutdown, chaos engineering

Autoscaling (HPA/KEDA), sharding, backpressure, hedged requests, geo-distribution, CDN

N+1, GC pauses, hot keys, tail latency, thundering herd, cold starts, TLS overhead

Unit, integration (Testcontainers), contract (Pact), fuzz, mutation, chaos, load, smoke

Monolith, microservices, serverless, event-driven, hexagonal, DDD, CQRS+ES, cell-based

GitHub Actions, GitLab CI, ArgoCD, Flux, Argo Rollouts, Renovate, SonarQube, GHAS

Terraform/OpenTofu, Pulumi, AWS CDK, CloudFormation, Bicep, Ansible, Crossplane, Helm

Spark, Flink, Kafka Streams, dbt, Airflow, Iceberg/Delta/Hudi, Debezium, vector DBs

Go, Java, Kotlin, Python, Rust, Node.js/TS, C#, Scala, Elixir, Ruby, PHP, C++

Distributed Monolith, God Service, Dual Writes, Sync-over-Async, Chatty Microservices, Unbounded Retry, N+1 Query

FinOps, spot instances, reserved capacity, right-sizing, cost allocation tags, waste detection

BFF pattern, push notifications, offline sync, GraphQL federation, edge caching, app config

Schema-per-tenant, row-level isolation, silo vs pool, noisy neighbor, tenant routing

OpenAPI, AsyncAPI, Protobuf, consumer-driven contracts (Pact), schema registry, versioning

ELT/ETL, data lakehouse, medallion architecture, schema evolution, data contracts, lineage

Edge compute (Cloudflare Workers, Lambda@Edge), CDN logic, geo-routing, edge databases

On-call, runbooks, blameless postmortems, incident severity, SLA communication, war rooms

System design interview patterns, capacity estimation, trade-off analysis, communication frameworks

QPS estimation, storage projections, bandwidth math, replication factors, back-of-envelope

SOC 2, GDPR, HIPAA, PCI-DSS, ISO 27001, data residency, audit logging, retention policies

L1/L2 cache, RAM, SSD, network hops, cross-region, DNS, TLS handshake — Jeff Dean's numbers updated

Strangler Fig, blue-green DB, dual writes, shadow traffic, feature flags, zero-downtime schema

Feature stores, model serving, A/B testing, GPU scheduling, MLOps pipelines, vector search

Canary, blue-green, rolling, feature flags, dark launches, ring deployments, rollback strategies

Side-by-side markdown table of two or more options — perfect for ADRs.

backendpro compare
"Kafka" "RabbitMQ"
--domain messaging

Exploratory design sessions with /d, /s, /all, /cmp, /stale.

backendpro --interactive

Every row can carry a Last Updated date. Filter or audit.

backendpro --stale
--domain pattern
--max-age-months 18

Every result includes a BM25 score and a high / medium / low label so the AI agent knows when to trust the hit.

--min-score 1.5

Plain-English queries reach the right rows even when keywords don't overlap. "Partial failure" → Saga.

--no-expand to disable

Lazy in-memory BM25 index, mtime-invalidated. Sub-millisecond repeat queries — agent loops stay snappy.

Schema-validates every CSV against its declared columns and date formats. Wired into CI to block bad rows.

backendpro-validate

652 pytest cases covering ranking quality, golden queries (239 assertions), edge cases, decision intelligence, intent classification, trust/verifiability, freshness, provenance, conflict detection, dedup, and coverage analysis. Ruff lint + CSV validation on Python 3.9 / 3.11 / 3.12.

Auto-detects query intent — comparison, troubleshoot, migration, incident, definition, best-practice, checklist — and applies structured templates to output.

backendpro "how to fix
connection pool exhaustion"
--intent troubleshoot

Optional embedding-based search via sentence-transformers + Reciprocal Rank Fusion with BM25. Graceful fallback to pure BM25.

pip install backendpro[semantic]
backendpro "conceptual query"
--engine hybrid

Optional cross-encoder re-ranking for precision-critical queries. Graceful fallback when not installed.

pip install backendpro[rerank]
backendpro "saga pattern"
--rerank

Constraint-aware ranked recommendations. Extracts facets (throughput, latency, cloud, consistency) and scores every candidate.

backendpro decide
"Kafka vs Pulsar vs Pub/Sub"

Auto-generates Architecture Decision Records in Markdown with context, options, trade-offs, and citations.

backendpro adr
"Redis vs Memcached"

Capacity-aware design documents with QPS estimates, storage projections, and replication calculations.

backendpro design
"Postgres for 50M DAU"

Every row carries a Source URL, Source Type, and Last Updated date. 100% coverage across 685 rows — official docs, RFCs, papers, OWASP cheat sheets.

backendpro-validate --strict

12 curated architectural tension rules surface trade-offs: retry vs latency, cache vs consistency, outbox vs CDC, sharding vs joins, and more.

backendpro conflicts
--domain cache

Weekly GitHub Action flags stale rows (>18 months) and broken Source URLs. Opens issues per domain — no manual auditing needed.

backendpro-validate
--check-urls

239 retrieval assertions across all 35 domains, 12 stacks, cross-domain, and compare mode. Guards BM25 ranking quality on every PR — actionable failure output shows expected vs actual top-5 with scores.

BM25 pairwise self-similarity detects near-duplicate rows within and across domains. Configurable threshold, allowlist for intentional overlaps.

backendpro dedup
--cross-domain --threshold 0.7

Per-domain coverage analysis with gap detection (missing categories), thin detection (<3 rows), and summary stats. Drives contribution by making gaps visible.

backendpro coverage
--domain messaging --json